EP1060393A1 - Laboratory test for assessing the tendency of a gasoline, optionally containing an additive, to cause deposits while the engine is running - Google Patents

Laboratory test for assessing the tendency of a gasoline, optionally containing an additive, to cause deposits while the engine is running

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Publication number
EP1060393A1
EP1060393A1 EP99958250A EP99958250A EP1060393A1 EP 1060393 A1 EP1060393 A1 EP 1060393A1 EP 99958250 A EP99958250 A EP 99958250A EP 99958250 A EP99958250 A EP 99958250A EP 1060393 A1 EP1060393 A1 EP 1060393A1
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EP
European Patent Office
Prior art keywords
gasoline
petrol
additive
tube
tendency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99958250A
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German (de)
French (fr)
Inventor
Patrick Gateau
Fabrice Paille
Yves Boscher
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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Application filed by IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP1060393A1 publication Critical patent/EP1060393A1/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2805—Oils, i.e. hydrocarbon liquids investigating the resistance to heat or oxidation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/04—Preparation or injection of sample to be analysed
    • G01N30/06—Preparation
    • G01N30/08—Preparation using an enricher
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/21—Hydrocarbon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
    • Y10T436/25375—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]

Definitions

  • the invention relates to a new laboratory test intended to evaluate the tendency of a petrol, possibly additive, to make deposits during the operation of an engine.
  • additives and additive formulations have been developed. These are generally polymeric surfactants comprising a lipophilic part ensuring solubility and a polar part capable of adsorbing on the walls of the engine in order to protect them or on insoluble particles in order to keep them in suspension.
  • a carrier oil which can be a polyolefin or a polyether.
  • the present invention proposes a new laboratory test intended to evaluate the tendency of a gasoline possibly additive to make deposits on the intake valves and in the combustion chambers.
  • the method of the invention can be defined, in general, by the fact that a tube is placed in the oven of the injector of a gas chromatograph; said tube is kept at a constant temperature under a constant air flow regulated by the flow meter of the chromatograph; injecting the gasoline or the additive gasoline to be evaluated through said tube; and the quantity of deposits formed is determined by weighing said tube after dismantling.
  • FIG. 1 schematically represents the apparatus used to carry out the test of the invention.
  • FIG. 2 shows an arrangement of an oven with a chromatograph tube and a needle such that it can be used to carry out this test.
  • the invention is described in more detail below, in conjunction with Figures 1 and 2.
  • the numbers in parentheses refer to these figures.
  • the tube (5) used consists of one (for example made of glass) of a gas chromatograph injector (1).
  • the tube (5) is placed in the oven (4) of the injector. It is maintained at a constant temperature under a constant air flow regulated by the chromatograph flow meter (1).
  • Petrol or additive petrol to be evaluated is injected through the tube (5), by means of a needle (6), most often positioned so that the injection takes place at a depth of approximately 10 mm inside the tube (5).
  • the gasoline is injected via a pump (2) at a flow rate of 0.5 to 2 kg, preferably of the order of 1 kg per 24 hours.
  • the mass injected is checked by weighing using the balance (3).
  • the quantity of deposits formed is determined by weighing the tube (5) after dismantling.
  • the laboratory test of the invention behaves like a test representative of the intake valves, whereas in the temperature range of 325 to 375 ° C and preferably to 350 ° C, said test is representative of the combustion chambers.
  • the gasoline to be evaluated is, before injection, freed from 15 to 25% and preferably 20% by mass of its lighter fractions by sweeping an inert gas at room temperature. Indeed, it is generally accepted that only heavy fractions are responsible for the formation of deposits and such a procedure makes it possible to avoid degassing of the petrol at the level of the pump which would cause its defusing.
  • the following examples illustrate the invention but should in no way be taken as limiting.
  • a reference gasoline whose characteristics are grouped in Table 1 and from which 20% by mass has been eliminated by argon sweeping at room temperature is introduced by means of an alternating piston pump
  • Hewlett-Packard 18740-80190® of a gas chromatograph by a needle positioned so that the injection takes place at a depth of 10 mm in the insert, the temperature of the injector being maintained at 275 ° C.
  • the insert is removed and weighed. The mass of deposits obtained is 30.5 mg.
  • Example 2 If in Example 1, all other things being equal, different quantities of a commercial detergent additive are added to the gasoline to be evaluated, the following results are obtained which are collated in Table 2. In this same table, appear the results of the Mercedes 102E engine tests (CEC procedure F-05-A-93) carried out with the same fuel samples and expressed in mass of deposits on the 4 intake valves. TABLE 2

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Of Engines (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The invention concerns a novel laboratory test for assessing the tendency of a gasoline, optionally containing an additive, to cause deposits while the engine is running, comprising the following steps: placing a tube in the oven of a gas chromatograph oven; maintaining said tube at a constant temperature under a constant air flow; injecting the gasoline or additive-containing gasoline to be tested through said tube; and determining the amount of deposits formed by weighing the tube after removal.

Description

TEST DE LABORATOIRE DESTINE A EVALUER LA TENDANCE LABORATORY TEST TO EVALUATE TREND
D'UNE ESSENCE, ÉVENTUELLEMENT ADDITIVEE, À FAIRE DES DÉPÔTSOF AN ESSENCE, POSSIBLY ADDITIVE, TO MAKE DEPOSITS
AU COURS DU FONCTIONNEMENT D'UN MOTEUR.DURING THE OPERATION OF AN ENGINE.
L'invention concerne un nouveau test de laboratoire destiné à évaluer la tendance d'une essence, éventuellement additivée, à faire des dépôts au cours du fonctionnement d'un moteur.The invention relates to a new laboratory test intended to evaluate the tendency of a petrol, possibly additive, to make deposits during the operation of an engine.
Des dépôts issus du carburant et du lubrifiant se forment dans un moteur tout au long de son fonctionnement. Ces dépôts se produisent sous l'effet de la chaleur en milieu oxydant dans les différents organes du circuit d'alimentation (carburateur, injecteurs, soupapes d'admission) et dans les chambres de combustion (culasse, tête de piston, soupape d'échappement, bougie). Ils entraînent des perturbations de fonctionnement parmi lesquels on peut citer la dégradation de l'agrément de conduite, l'augmentation des émissions ou même la destruction du moteur.Deposits from fuel and lubricant form in an engine throughout its operation. These deposits occur under the effect of heat in an oxidizing medium in the various organs of the supply circuit (carburetor, injectors, intake valves) and in the combustion chambers (cylinder head, piston head, exhaust valve , candle). They cause operating disturbances, among which we can cite the deterioration of the driveability, the increase in emissions or even the destruction of the engine.
Pour lutter contre cet encrassement, de nombreux additifs et formulations d'additifs ont été mis au point. Ce sont généralement des tensioactifs polymères comportant une partie lipophile assurant la solubilité et une partie polaire susceptible de s'adsorber sur les parois du moteur afin de les protéger ou sur les particules insolubles afin de les maintenir en suspension. Dans le cas des moteurs à allumage commandé, ils sont le plus souvent associés à une huile porteuse qui peut être une polyoléfine ou un polyéther. Ces additifs sont efficaces pour diminuer et même supprimer les dépôts dans le circuit d'alimentation mais ne permettent pas de diminuer les dépôts dans les chambres de combustion. Il a même été montré que ces additifs peuvent entraîner une augmentation de ces dépôts.To combat this fouling, numerous additives and additive formulations have been developed. These are generally polymeric surfactants comprising a lipophilic part ensuring solubility and a polar part capable of adsorbing on the walls of the engine in order to protect them or on insoluble particles in order to keep them in suspension. In the case of spark ignition engines, they are most often associated with a carrier oil which can be a polyolefin or a polyether. These additives are effective in reducing and even eliminating deposits in the fuel system but do not reduce deposits in the combustion chambers. It has even been shown that these additives can lead to an increase in these deposits.
La tendance d'une essence à faire des dépôts au cours du fonctionnement d'un moteur est généralement évaluée par des essais moteurs effectués au banc mais ces essais sont longs, coûteux et nécessitent des appareillages lourds ainsi qu'une importante quantité de carburant. Différents essais moteur doivent être effectués pour mesurer l'encrassement dans les différentes parties du moteur. L'essai moteur le plus couramment utilisé en Europe pour évaluer l'aptitude d'une essence ou d'une essence additivée à maintenir propres les soupapes d'admission est l'essai moteur Mercedes 102E d'une durée de 60 heures nécessitant environ 300 litres de carburant.The tendency of a gasoline to make deposits during the operation of an engine is generally evaluated by engine tests carried out on the bench, but these tests are long, expensive and require heavy equipment as well as a large quantity of fuel. Different engine tests must be performed to measure fouling in different parts of the engine. The most commonly used engine test in Europe to assess the suitability of a petrol or petrol additive to keep the intake valves clean is the 60-hour Mercedes 102E engine test requiring approximately 300 liters of fuel.
De nombreux essais au niveau laboratoire ont été proposés dans le passé pour simuler l'encrassement dans les différentes parties du moteur mais aucun jusqu'à maintenant n'a conduit à des résultats suffisamment prédictifs pour être utilisé couramment. C'est ainsi qu'en 1997, un groupe d'investigation (IF031) chargé par le Coordination European Council (CEC) de recenser les tests de laboratoire susceptibles d'évaluer la qualité des essences et des carburants Diesel en terme de dépôts a conclu qu'il n'existait aucune méthode permettant d'atteindre cet objectif. Seuls un essai moteur Honda de 20 heures et une analyse basée sur la thermogravimétrie des gommes d'une essence pourraient permettre, dans le meilleur des cas, d'effectuer une présélection pour la mise au point d'additifs.Numerous tests at laboratory level have been proposed in the past to simulate fouling in the various parts of the engine but none so far has led to results sufficiently predictive to be used routinely. In 1997, an investigation group (IF031) commissioned by the Coordination European Council (CEC) to identify laboratory tests likely to assess the quality of petrol and diesel fuels in terms of deposits concluded that there was no method to achieve this goal. Only a Honda engine test of 20 hours and an analysis based on the thermogravimetry of the gums of a gasoline could allow, in the best of cases, to make a preselection for the development of additives.
La présente invention propose un nouveau test de laboratoire destiné à évaluer la tendance d'une essence éventuellement additivée à faire des dépôts sur les soupapes d'admission et dans les chambres de combustion. La méthode de l'invention peut être définie, d'une manière générale par le fait que l'on place un tube dans le four de l'injecteur d'un chromatographe en phase gazeuse ; on maintient ledit tube à une température constante sous un débit d'air constant régulé par le débitmètre du chromatographe ; on injecte l'essence ou l'essence additivée à évaluer à travers ledit tube ; et on détermine la quantité de dépôts formés par pesée dudit tube après démontage.The present invention proposes a new laboratory test intended to evaluate the tendency of a gasoline possibly additive to make deposits on the intake valves and in the combustion chambers. The method of the invention can be defined, in general, by the fact that a tube is placed in the oven of the injector of a gas chromatograph; said tube is kept at a constant temperature under a constant air flow regulated by the flow meter of the chromatograph; injecting the gasoline or the additive gasoline to be evaluated through said tube; and the quantity of deposits formed is determined by weighing said tube after dismantling.
La figure 1 représente schématiquement l'appareillage mis en ouvre pour réaliser le test de l'invention.FIG. 1 schematically represents the apparatus used to carry out the test of the invention.
La figure 2 montre une disposition de four de tube de chromatographe et d'aiguille telle qu'on peut l'utiliser pour réaliser ce test. On décrit l'invention de manière plus détaillée ci-après, en liaison avec les figures 1 et 2. Les nombres entre parenthèses font référence à ces figures.FIG. 2 shows an arrangement of an oven with a chromatograph tube and a needle such that it can be used to carry out this test. The invention is described in more detail below, in conjunction with Figures 1 and 2. The numbers in parentheses refer to these figures.
Plus particulièrement, le tube (5) utilisé consiste en un (par exemple en verre) d'injecteur de chromatographe en phase gazeuse (1). Cet insert peut être un tube droit de diamètre et de longueur appropriés à l'injecteur utilisé (par exemple diamètre intérieur = 4 mm et longueur = 80 mm) ou encore un insert possédant une chambre de mélange, tel que les inserts à restriction de référence Hewlett- Packard 18740-80190®. Ce dernier type d'insert sera choisi quand la tendance à former des dépôts du carburant utilisé est faible. Le tube (5) est placé dans le four (4) de l'injecteur. Il est maintenu à une température constante sous un débit d'air constant régulé par le débitmètre du chromatographe (1). On injecte l'essence ou l'essence additivée à évaluer à travers le tube (5), au moyen d'une aiguille (6), positionnée le plus souvent de façon que l'injection se fasse à une profondeur d'environ 10 mm à l'intérieur du tube (5). L'essence est injectée par l'intermédiaire d'une pompe (2) à un débit de 0,5 à 2 kg, de préférence de l'ordre de 1 kg par 24 heures. La masse injectée est contrôlée par pesée au moyen de la balance (3).More particularly, the tube (5) used consists of one (for example made of glass) of a gas chromatograph injector (1). This insert can be a straight tube of diameter and length suitable for the injector used (for example internal diameter = 4 mm and length = 80 mm) or else an insert having a mixing chamber, such as the reference restriction inserts Hewlett-Packard 18740-80190®. The latter type of insert will be chosen when the tendency to form deposits of the fuel used is low. The tube (5) is placed in the oven (4) of the injector. It is maintained at a constant temperature under a constant air flow regulated by the chromatograph flow meter (1). Petrol or additive petrol to be evaluated is injected through the tube (5), by means of a needle (6), most often positioned so that the injection takes place at a depth of approximately 10 mm inside the tube (5). The gasoline is injected via a pump (2) at a flow rate of 0.5 to 2 kg, preferably of the order of 1 kg per 24 hours. The mass injected is checked by weighing using the balance (3).
La quantité de dépôts formée est déterminée par pesée du tube (5) après démontage. Dans la méthode de l'invention, on a pu montrer l'importance de la température sur la quantité de dépôts formés et il a été possible de définir deux régimes de température en relation avec les conditions rencontrées dans un moteur. A une température comprise entre 250 et 300 °C et de préférence à une température voisine de 275 °C, le test de laboratoire de l'invention se comporte comme un test représentatif des soupapes d'admission, alors que dans le domaine de température de 325 à 375 °C et de préférence à 350 °C, ledit test est représentatif des chambres de combustion.The quantity of deposits formed is determined by weighing the tube (5) after dismantling. In the method of the invention, it was possible to show the importance of the temperature on the quantity of deposits formed and it was possible to define two temperature regimes in relation to the conditions encountered in an engine. At a temperature between 250 and 300 ° C and preferably at a temperature close to 275 ° C, the laboratory test of the invention behaves like a test representative of the intake valves, whereas in the temperature range of 325 to 375 ° C and preferably to 350 ° C, said test is representative of the combustion chambers.
Dans un mode préféré de l'invention, l'essence à évaluer est, avant injection, débarrassée de 15 à 25 % et de préférence de 20 % en masse de ses fractions les plus légères par balayage d'un gaz inerte à température ambiante. En effet, il est généralement admis que seules les fractions lourdes sont responsables de la formation des dépôts et une telle procédure permet d'éviter le dégazage de l'essence au niveau de la pompe qui entraînerait son désamorçage. Les exemples suivants illustrent l'invention mais ne doivent en aucune manière être considérés comme limitatifs.In a preferred embodiment of the invention, the gasoline to be evaluated is, before injection, freed from 15 to 25% and preferably 20% by mass of its lighter fractions by sweeping an inert gas at room temperature. Indeed, it is generally accepted that only heavy fractions are responsible for the formation of deposits and such a procedure makes it possible to avoid degassing of the petrol at the level of the pump which would cause its defusing. The following examples illustrate the invention but should in no way be taken as limiting.
EXEMPLE 1EXAMPLE 1
Une essence de référence dont les caractéristiques sont regroupées dans le tableau 1 et dont on a éliminé 20 % en masse par balayage à l'argon à température ambiante est introduite par l'intermédiaire d'une pompe à piston alternatifA reference gasoline whose characteristics are grouped in Table 1 and from which 20% by mass has been eliminated by argon sweeping at room temperature is introduced by means of an alternating piston pump
Proéminent®, à raison de 1 kg en 24 heures dans l 'insert en verre (référenceProeminent®, at a rate of 1 kg in 24 hours in the glass insert (reference
Hewlett-Packard 18740-80190®) d'un chromatographe en phase gazeuse par une aiguille positionnée de façon à ce que l'injection se fasse à une profondeur de 10 mm dans l'insert, la température de l'injecteur étant maintenue à 275 °C. A la fin de l'essai, après refroidissement, l'insert est démonté et pesé. La masse de dépôts obtenus est de 30,5 mg. Hewlett-Packard 18740-80190®) of a gas chromatograph by a needle positioned so that the injection takes place at a depth of 10 mm in the insert, the temperature of the injector being maintained at 275 ° C. At the end of the test, after cooling, the insert is removed and weighed. The mass of deposits obtained is 30.5 mg.
TABLEAU 1TABLE 1
EXEMPLES 2 A 4EXAMPLES 2 TO 4
Si dans l'exemple 1, toutes choses étant égales par ailleurs, on ajoute dans l'essence à évaluer différentes quantités d'un additif détergent commercial, on obtient les résultats suivants qui sont rassemblés dans le tableau 2. Dans ce même tableau, figurent les résultats des essais moteurs Mercedes 102E (Procédure CEC F-05-A-93) réalisés avec les mêmes échantillons d'essence et exprimés en masse de dépôts sur les 4 soupapes d'admission. TABLEAU 2If in Example 1, all other things being equal, different quantities of a commercial detergent additive are added to the gasoline to be evaluated, the following results are obtained which are collated in Table 2. In this same table, appear the results of the Mercedes 102E engine tests (CEC procedure F-05-A-93) carried out with the same fuel samples and expressed in mass of deposits on the 4 intake valves. TABLE 2
Ces résultats montrent que le test de laboratoire de l'invention (T = 275 °C) permet de bien reproduire les effets d'un additif détergent commercial sur la masse de dépôts des soupapes d'admission.These results show that the laboratory test of the invention (T = 275 ° C) makes it possible to reproduce well the effects of a commercial detergent additive on the mass of deposits of the intake valves.
EXEMPLES 5 A 8EXAMPLES 5 TO 8
Si dans les exemples 1 à 4, toutes choses étant égales par ailleurs, la température est maintenue à 350 °C au lieu de 275 °C, on obtient les résultats suivants mentionnés dans le tableau 3. Dans ce même tableau, figurent les masse de dépôts collectés dans les chambres de combustion en fin d'essais moteurs Mercedes 102E (Procédure CEC F-05-A-93) réalisés avec les mêmes échantillons d'essences.If in examples 1 to 4, all other things being equal, the temperature is maintained at 350 ° C. instead of 275 ° C., the following results are obtained, mentioned in table 3. In this same table, the masses of deposits collected in the combustion chambers at the end of Mercedes 102E engine tests (CEC procedure F-05-A-93) carried out with the same fuel samples.
TABLEAU 3TABLE 3
Ces résultats montrent que le test de laboratoire de l'invention mis en oeuvre à 350 °C permet de bien reproduire l'influence d'un additif détergent commercial sur la masse de dépôts formés dans les chambres de combustion. These results show that the laboratory test of the invention implemented at 350 ° C makes it possible to reproduce well the influence of a commercial detergent additive on the mass of deposits formed in the combustion chambers.

Claims

REVENDICATIONS
1. Méthode de laboratoire pour évaluer la tendance d'une essence ou d'une essence additivée à faire des dépôts au cours du fonctionnement d'un moteur, caractérisée en ce que : on place un tube dans le four de l'injecteur d'un chromatographe en phase gazeuse ; - on maintient ledit tube à une température constante sous un débit d'air constant ; - on injecte l'essence ou l'essence additivée à évaluer à travers ledit tube ; et on détermine la quantité de dépôts formés par pesée dudit tube après démontage.1. Laboratory method for evaluating the tendency of petrol or petrol with additives to deposit during the operation of an engine, characterized in that: a tube is placed in the injector furnace a gas chromatograph; - Maintaining said tube at a constant temperature under a constant air flow; - The petrol or petrol with additives to be evaluated is injected through said tube; and the quantity of deposits formed is determined by weighing said tube after dismantling.
2. Méthode selon la revendication 1 caractérisée en ce que le tube est un insert en verre. 2. Method according to claim 1 characterized in that the tube is a glass insert.
3. Méthode selon la revendication 2 caractérisée en ce que l'insert en verre possède une chambre de mélange.3. Method according to claim 2 characterized in that the glass insert has a mixing chamber.
4. Méthode selon l'une des revendications 1 à 3 caractérisée en ce que l'on injecte par l'intermédiaire d'une pompe l'essence ou l'essence additivée à évaluer à travers une aiguille positionnée de telle manière que l'injection se fasse à une profondeur d'environ 10 mm à l'intérieur dudit tube.4. Method according to one of claims 1 to 3 characterized in that one injects via a pump the gasoline or the gasoline additive to be evaluated through a needle positioned so that the injection takes place at a depth of about 10 mm inside said tube.
5. Méthode selon l'une des revendications 1 à 4 caractérisée en ce que l'essence ou l'essence additivée à évaluer, est injectée à un débit constant de 0,5 à 2 kg par 24 heures.5. Method according to one of claims 1 to 4 characterized in that the gasoline or the additive gasoline to be evaluated is injected at a constant flow rate of 0.5 to 2 kg per 24 hours.
6. Méthode selon l'une des revendications 1 à 4 caractérisée en ce que l'essence ou l'essence additivée à évaluer, est injectée à un débit constant d'environ 1 kg par6. Method according to one of claims 1 to 4 characterized in that the gasoline or the additive gasoline to be evaluated is injected at a constant flow rate of approximately 1 kg per
24 heures. 24 hours.
7. Méthode selon l'une des revendications 1 à -6 caractérisée en ce que l'essence à évaluer est débarrassée, avant injection, de 15 à 25 % en masse de ses fractions les plus légères par balayage d'un gaz inerte à température ambiante.7. Method according to one of claims 1 to -6 characterized in that the gasoline to be evaluated is freed, before injection, from 15 to 25% by mass of its lightest fractions by sweeping an inert gas at temperature ambient.
8. Méthode selon l'une des revendications 1 à 6 caractérisée en ce que l'essence à 5 évaluer est débarrassée, avant injection, de 20 % en masse de ses fractions les plus légères par balayage d'un gaz inerte à température ambiante.8. Method according to one of claims 1 to 6 characterized in that the gasoline to be evaluated is freed, before injection, of 20% by mass of its lightest fractions by sweeping an inert gas at room temperature.
9. Méthode selon l'une des revendications 1 à 8, adaptée pour évaluer la tendance d'une essence ou d'une essence additivée à faire des dépôts sur les soupapes d'admission, caractérisée en ce que la température est maintenue constante à une9. Method according to one of claims 1 to 8, suitable for evaluating the tendency of a petrol or an additive petrol to deposit on the intake valves, characterized in that the temperature is kept constant at a
10 valeur de 250 à 300 °C et de préférence voisine de 275 °C. lO.Méthode selon l'une des revendications 1 à 8, adaptée pour évaluer la tendance d'une essence ou d'une essence additivée à faire des dépôts sur les soupapes d'admission, caractérisée en ce que la température est maintenue constante à une valeur voisine de 275 °C.10 value from 250 to 300 ° C and preferably close to 275 ° C. 10. Method according to one of claims 1 to 8, suitable for evaluating the tendency of petrol or petrol with additives to deposit on the intake valves, characterized in that the temperature is kept constant at a value close to 275 ° C.
15 11. Méthode selon l'une des revendications 1 à 8, adaptée pour évaluer la tendance d'une essence ou d'une essence additivée à faire des dépôts dans les chambres de combustion, caractérisée en ce que la température est maintenue constante à une valeur de 325 à 375 °C.11. Method according to one of claims 1 to 8, suitable for evaluating the tendency of a petrol or an additive petrol to make deposits in the combustion chambers, characterized in that the temperature is kept constant at a value from 325 to 375 ° C.
12.Méthode selon l'une des revendications 1 à 8, adaptée pour évaluer la tendance 20 d'une essence ou d'une essence additivée à faire des dépôts dans les chambres de combustion, caractérisée en ce que la température est maintenue constante à une valeur voisine de 350 °C. 12. Method according to one of claims 1 to 8, suitable for evaluating the tendency of a gasoline or an additive gasoline to deposit in the combustion chambers, characterized in that the temperature is kept constant at a value close to 350 ° C.
EP99958250A 1998-12-22 1999-12-06 Laboratory test for assessing the tendency of a gasoline, optionally containing an additive, to cause deposits while the engine is running Withdrawn EP1060393A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9816294 1998-12-22
FR9816294A FR2787580B1 (en) 1998-12-22 1998-12-22 NEW LABORATORY TEST FOR EVALUATING THE TREND OF A FUEL, POSSIBLY ADDED, TO MAKE DEPOSITS DURING THE OPERATION OF AN ENGINE
PCT/FR1999/003027 WO2000037936A1 (en) 1998-12-22 1999-12-06 Laboratory test for assessing the tendency of a gasoline, optionally containing an additive, to cause deposits while the engine is running

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EP1060393A1 true EP1060393A1 (en) 2000-12-20

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CA (1) CA2320923A1 (en)
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US8249816B2 (en) * 2004-02-13 2012-08-21 Chevron Oronite Company, Llc High throughput screening methods for fuel compositions
GB2504527A (en) * 2012-08-02 2014-02-05 Rolls Royce Plc Method and apparatus for testing a sample surface
US9304119B2 (en) 2012-08-30 2016-04-05 Shell Oil Company System and method for testing engine lubricants
JP6125246B2 (en) * 2013-01-30 2017-05-10 日野自動車株式会社 Fuel deposit unit test equipment
RU2642236C1 (en) * 2017-06-08 2018-01-24 Федеральное государственное унитарное предприятие "Центральный институт авиационного моторостроения имени П.И. Баранова" Method of comparative evaluation of efficiency of fuel combustion promoters in combustion chamber of air-jet engine
CN108088683B (en) * 2018-01-24 2024-03-08 珠海莱科力环保科技有限公司 Diesel engine nozzle blockage simulation test method and equipment

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JP2002533676A (en) 2002-10-08
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US6566142B1 (en) 2003-05-20
CA2320923A1 (en) 2000-06-29
FR2787580A1 (en) 2000-06-23

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